Take-up for sewing-machines.



No. 637,744. 4 Patented Nov. 2|, I899. Wv M. AMMERMAN.

TAKE-UP FOR SEWING MACHINES.

(Application filed Mar. 28, 1897.) I

(No Model.) 3 Sheets-Sheet I.

n 9 w W. V o N d e t n 6 a P N A M .nn E M M A M W TAKE-UP FOR SEWINGMACHINES.

(Application filedMar. 26, 1 897.)

3 SheetsSheet 2.

(no mm.)

vfme aw M.

No. 637,744. Patented Nov. '21, I899.

W. M. AMMERMAN.

TAKE-UP FOR SEWING MACHINES.

(Application filed Mar. 26, 1897.) (No Mod el.) 3 Sheets-Sheet 3.

Jig. x

Wfirwsse-s: jwni'or aagwm. V

8 M w%O..-,,. w MM- k t m: NORRIS PETERS co. FHOTO-LITHQ, wnsmnsrou. I:vc.

' UNITED "STATE-s PATENT CFFICE.

EDWIN J. TOOF,

OF SAME PLACE.

TAKE-UP FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 637,744, dated November21, 1899.

Application filed March 26, 1897. Serial No. 629,331. (No model.)

To all whom it may concern.-

Be it known that I,WILLIAM M. AMMER- MAN, a citizen of the UnitedStates, and a resident of the city and county of New Haven, State ofConnecticut, have invented new and useful Improvements in Take-Up andThread- Controlling Mechanism for Sewing-Machine's, of which thefollowing description, taken in connection with the drawings herewithaccompanying, is a specification.

This invention relates particularly to a take-up and th read-controllingmechanism for sewing-machines and it consists, first, in thecombination,with the vertically-reciprocating needle-bar of the machine,of a vertically-reciprocating take-up device confined to movement in apath parallel with the path of movement of the needle-bar and means foractuating the needle-bar and take-up whereby the latter is caused tomove at a less speed than the needlebar when giving down the thread andcaused to move upward in the same time therewith, said means including arotary shaft carrying a crank-pin for engaging with said needle-bar andtake-u p device; secondly, the invention further consists in thecombination, with the needle-bar provided with a cam-groove, of atake-up device consisting of a frame'supported to slide upon theneedlebar and provided with a cam-slot therein and an antifriction-rollhaving means whereby it is permanently connected with the needle-bar andtake-up device within the said cam-groove and cam-slot with which suchparts are provided and holding the parts vertically in position relativeto each other when disengaged from their operating means; thirdly, theinvention further consists in the combination, with the needle-bar andtake-up actuated in the manner described, of ahorizontally-reciprocating looper having means for controlling the slackthread given down by the take-up during the descent of the needle, and,fourthly, the invention further consists in various other details ofconstruction and combination of parts, as hereinafter set forth indetail, and pointed out in the claims.

Referring to the drawings, Figure 1 represents a rear view of thesewing-machine faceplate removed from its position upon the arm of themachine, also showing the needle-bar with my improved take-up deviceconnected therewith; Fig. 2, a Vertical section through a portion of thearm of the machine, at the take-up device, and the front end of theupper rotating driving-shaft with its crank-disk for operating the saidneedle-bar and take-up device; Figs. 3, 4, 5, 6, and 7, a front endelevation of the sewing-machine arm with its supported needle-bar,presser-bar, and takeup device, also a looper and its carrier, showingin full and dotted lines the relative positions of the needle-bar andtake: up with their connected operating parts and the looper atdifferent times during the formation of a stitch; Fig. 8, a plan view ofthe front end of the bed-plate of the machine with the slide-platesremoved and a portion of the bedplate broken away, showing the looperand its carrier; and Figs. 9 and 10, detail views to be hereinafterreferred to.

To explain in detail, the bed-plate a, the throat-plate a, the arm a thepresser-bar a and the needle-bar a are all of usual form andconstruction, as found in the ordinary sewing-machine. The needle-bar ais provided with a plate a secured thereon, having a cam-groove a intowhich latter a crankpin b, carried by the disk I) on the end of theupper rotating driving-shaft 12 extends and front end thereof, showingthe needle-bar,

operates to give the said needle-bar its vertical movement.

According to my present invention, as before stated, I have supportedthe take-up device (represented at c) to slide upon the needle-bar andreceive its movement in common with thelatter from the saidoperatingcrankpin 1). This take-up device, as more clearly shown inFigs. 1 and 2, consists of a plate a, which is provided with sideflanges c 0 adapted forclosely em bracing the sides of the needle-bar,as shown, and having one end thereof projecting outwardly through avertically-elongated slot 0 in the face-plate of the machine, whichprojecting end is provided with an eye a therein to receive theneodle-thread, which is adapted to pass through the same in its passagefrom the spool or thread-supply to the needle in the usual manner. Asecond plate or frame 61 is rigidlysecured to the opposite sides of theplate 0 in a position at the rear of the needle-bar by suitablefasteuing screws or rivets d, as shown. The plates 0' and 01 being thusconnected act as though formed in one integral piece, and,

closelyembracing' the four" sides of the nee dle-bar at their point ofconnection, are supwill be held in a ported and guided thereon. The saidplate 01 extends in a position behind the grooved plate a on theneedle-bar and between the same and the disk I) on the driving-shaft andis provided with'a cam .slot or opening d? therein, through which thecrank-pin b is passed when entered into the groove in the plate a on theneedle-bar, as shown in Fig; 2, whereby the take-up-device will be operated in combination with the needle-bar in a manner as will hereinafterbe set forth in detail. The plate 0?, above the said'cam-slot therein,is provided with a vertically-elongated opening d therein, whichreceives the end of a fixed pin (1 located upon the needle-bar. This pin61 serves as a partialsupport and guide for the take-up device as awhole and holds the plate d thereof fromlateral movement relative to theneedle bar when being operated. It will be understood that this saidfixed pin d extending into the opening 61 in the plate 6?, as described,will retain the take-up device in vertical position upon the needle-bar;but in order to support the same so thatits cam-slot d will always be inproper operative position relative to the groove a in the needle-barplate to receive the crank-pin b therethrough whenit is entered into thesaid groove I have provided an antifriction-roll 0, into which thecrankpin is adapted to be fitted, of sufficient width for extending intoboth the cam-slot d and cam-groove a, whereby the take-up deviceposition with some portion of its slot d opposite the groove a, as shownin Fig. 1. The take-up cam and the needle bar cam are also held in suchdescribed position relative to each other by means of the fixed pin d onthe needle-bar extending into the opening 01 of the take-up, as will beobvious upon reference to Fig. 1. The takeup being supported andoperated in connection with the needle-bar, as described, receives thesame length of throw or movement as the needle-bar, thus reducing to aminimum the amount of slack thread produced. The take-up slot 01 is madenarrower than the needle-bar groove a and the roll e is formed with aportion of its periphery or less circumference than the other toaccommodate itself to the different widths of the slot and groove, as'clearlyshown in Fig. 1. 'In this manner the roll is locked inconnection withthe needle-bar and take-up device and enables the latterto be located and adjusted in proper operative position upon theneedlebar before the latter is placed in connection "with the machine,so that when the needlebar is placed in position and the crank-pin b Ientered into its groove Within the roll e the take-up is thereby alsoplaced in operative connection with the machine. The take-up devicebeing thus supported wholly upon the needle-bar between the bearings ofthe latter and independent of permanent connection,

clearly shown in Fig. 8.

the advantage of which will be obvious.

The take-up device is timed to operate, in

combination with the needle-bar and needle, so that in drawing up thestitch 'it will move upward with the needle in the same time therewith;butin moving downward from the position shown in Fig. 4 the take-up onlymoves about one-half as fast as the needlebar, so as to give down acorrespondingly-less amount of thread than would be given down by theneedle-bar in case the latter was used as the take-up. In this mannerthe amount of slack thread to be controlled bythe usualspring-controller f is greatly reduced, whereby less strain beinguponthe same it is better enabled to control the thread when the machine isrun at a'h'igh rate of speed, and

it also enables such spring-controller to be entirely dispensed withwhen a looper is employed in lieu of the shuttle in a manner as willhereinafter be referred to. The relative movements of the needle-bar andtake-up, as described, are secured by-forming the cam-slot in thetake-up and the cam-groove in the needle-bar plate parallel with eachother at one side of the needle-bar, in which parallel portions thecrank-pin operates in giving the parts their upward movement and formingthe same at different angles to each other at the opposite side of theneedle-bar, in which latter portions the crank-pin operates in givingthe diflerential movement to the parts when being moved downward. Theposition taken by the two cams and the operating crank-pin therein atdilterent times during the upward-and-downward movement of theneedle-bar and take-up are clearly shown by dotted lines in Figs. 3, 4,5, 6, and '7. As another feature of my present invention I have provideda looper for chainrstitch sew ing having means for coacting with thesaid needle-bar and take-up device, as described in controlling theslack thread. This looper (represented at h) is adapted to be usedinterchangeably with the ordinary shuttle and be seated and securedwithin the horizontallyvibrating shuttle-carrie'rt' in a manner as moreThe said looper h consists of a supportin -shank h for connection withthe carrier 1', provided with a looperarm 71, arranged substantiallyparallel with the wall of the raceway, which arm is provided with aloop-engaging hookh at one end thereof. I As the thread-loop n is thrownout by the needle, as shown in Fig. 3, at which time the take-up is alsoat about its lowest point, the said hook it of the looper is thenadvanced in the direction indicated by the arrow to be entered into thesaid loop. The looper then continues to advance in the same directionuntil the loop n has reached the crotch between the hook and the arm, atwhich time it is carried onto the arm 71 as shown in Fig. 4, by reasonof a short upward bend h being formed at the point of union between theparts, which serves to guide the loop from the hook to the said arm, aswill be obvious. The looper now begins its return movement, and when ithas reached the position, as shown in Fig. 4, with its crotch in linebelow the path of the needle the take-up has reached its highest point,as shown. Now, as the looper continues in its said return movement andthe take-up begins to descend, in order to control such slack thread asis given down by the take-up to keep the same away from the point of theneedle until the latter has entered the goods I have provided thelooperarm h with an inclined surface 71, extending downwardly from theend thereof, and with a lateral swell h as more clearly shown in Fig.10, which act upon the loop at such time to draw the thread down belowthe clothplate and prevent the forming of any slack thread until thepoint of the needle has reached the goods, as shown in Fig. 5. In thismanner the usual spring or other device for I controlling the slackthread maybe dispensed with. After the slack thread given down by thetake-up device has been thus controlled by the peculiar formation of thelooper and the needle has entered the. goods the looper then continuesin its said return movement from the position shown in Fig. 5 to thatshown in Fig. 6, in which latter position the loop has reached the rearend of the looperarm and the needlehas reached its first dip, so called,to throw out another loop 02, at which time the shuttle (shown in dottedlines) would, if used, enter the same. From the position shown in Fig. 6thelooper now moves forward to enter its hook it into the loop 01. as itis thrown out at the second dip of the needle and cast off the firstloop n, as shown in Fig. 7. The said loop at, as it is thus cast off thelooper, encircles the loop 71., just engaged by the latter, and is drawnup by the take-up to form a chain-stitch in the usual manner, as wellunderstood by those skilled in the art.

Having thus set forth my invention, what I claim as new, and desire tosecure by Letters Patent of the United States, is

1. In a sewing-machine, the combination, with a vertically-reciprocating needle-bar pro-" vided with a cam-groove, and a driving-shaft carryinga crank-pin which operates within said cam-groove, of a take-up device,consisting of a frame provided with a thread-engaging arm and having apart thereof extending adjacent to said cam-groove to pre-' sent asurface for the engagement of said crank-pin, means, independent of saidcrankpin, movably connecting the take-up device with the needle-bar topermit the same to angle relative to the cam-groove whereby the descentof the take-up is rendered slower than that of the needle-bar.

2. In a sewing-machine, the combination, of a vertically-reci procatin gneedle-bar, a vertically-reciprocating take-up device confined.

to movement in a path parallel with the path of movement of theneedle-bar, and means for actuating said needle-bar and take-up wherebythe latter is caused to move at a less speed than the needle-bar whengiving down the thread and caused to move upward in the same timetherewith, said means including a rotary shaft carrying a crank-pin forengaging with said needle-bar and take-up device.

3. In a sewing-machine, the combination, with the needle-bar providedwith a camgroove, of a take-up device, consisting of a frame supportedto slide upon the needle-bar and provided with a cam-slot therein, anantifriction-roll having means whereby it is permanently connected withthe needle-bar and take-up device within the said cam-groove andcam-slot with which such parts are .pro-

vided and holding the parts vertically in position relative to eachother when disengaged from their operating means, and means foroperatingthe take-up and needle-bar.

' 4. In a sewing-machine, the combination, with the needle-bar providedwith a camgroove, of a take-up device, consisting of a frame supportedto slide upon the needle-bar and provided with a cam-slot therein, thelatter being of less width than the cam-groove of the needle-bar, anantifriction-roll sup ICC ported within both the said cam-groove andcam-slot to support the take-up in vertical position upon the needle-barand having a portion of its periphery of less circumference than theother to accommodate itself to the difference in width of the cam-grooveand cam-slot and be retained from displacement within the same, and anoperating-crank having a pin thereon extending into an openingwithinsaid autifriction-roll, for the purpose set forth.

5. In a sewing-machine, the combination, with a vertically-reciprocatingneedle-bar, a vertically-reciprocating take-up, device confined tomovement in a path parallel with the path of movement of the needle-bar,and means for actuating said needle-bar and takeup whereby the latter iscaused to move at a less speed than the needle-bar when giving down thethread and caused to move upward in the same time therewith, said meansincluding a rotary shaft carrying a crank-pin for engaging with theneedle-bar and takeup, of a horizontally-reciprocatin g looper havingmeans. for controlling the slack thread given down by the take-up duringthe del Vitnesses:

CHAS. F. DANE, B. E. SWAINE.

IIO

